厂坝矿区浅层地壳剖面的速度结构

THE VELOCITY STRUCTURE OF THE SHALLOW CRUST PROFILE IN CHANGBA MINERAL REGION

摘要:

厂坝铅锌矿是重点开发矿区,其山体陡峭,工业爆破时容易造成山体滑坡。为研究边坡稳定性,我们使用人工地震方法,在厂坝铅锌矿区500米范围内,布设了两条交汇测线系统,反演和正演了该工作区域的浅部地壳速度剖面,得出地表直达纵波的平均速度为1.74公里/秒;对1号、2号公路地区和1至3号平台斜坡地区进行了速度分层,确定从地表向下540米深可大致分为五个速度层,速度从1.74公里/秒到2.99公里/秒。
本文结果表明,CBY-2爆破地震仪可用于浅层地震勘探。我们所用的数学处理方法亦可在其它浅部地震勘探中使用。

Abstract:

Changba Lead-Zinc Mineral Region (in Gansu Province)is a major developing region, but its mountain is precipitous and the mountain slope is easily caused when blasting is done. In order to study the stability of the slope, we applied the method of artificial seismic wave. A surveillance system with two lines intersected was laid, the inversion and forward of the shallow crust velocity profile in the region was made. We considered that the average velocity of the direct-P wave is 1.74 (km/S)near surface, No1 and No2 highway and No1-3 stages region may be divided into five layers from 1.74(km/S) to 2.99(km/S)in velocity, till 540m from surface.
It shows that the explosion seismometer of type CBY-2 is suitable for the shallow seismic exploration and the mathematical procedure used by us is applied to other shallow seismic exploration as well.